{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Chemical"], "input": "Percutaneous transdermal absorption of esculetin ( 6 , 7 - dihydroxycoumarin ) , an oxidative damage inhibitor , was evaluated by means of in vitro permeation studies in which vertical Franz - type diffusion cells and pig ear skin were employed ."}
{"Chemical": ["esculetin", "6 , 7 - dihydroxycoumarin"]}